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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea853f6ec6996e1b9a7637be6e5fbe3a7b783b9308d1f7210053b715d648de1' 
  AND token = 'tuJvh6q9I0fFY2E46IUg2wYGMd6LTT/dDKgRbytnDLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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