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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562cf9197d00227818d0455399f81a5e137b2dba0ecad5ad937e9c6d43b24ce6' 
  AND token = '/uQTH3YT83TaIC7eHvi3ntcx+9e7sPP/i3IhIfQU+ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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