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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e97ae703f1a17c0c778108d157d1beff5ccdae94167bced35c2f8f89a5f063' 
  AND token = 'wMDXBekH7TtjMCpyMVY3gtbXiyvtMK3oriblIQ/TcMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}