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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669d01cb5c92c310cabffd2fca2234d745b71ddb48ebeb7a2d95cd0bd5df997d' 
  AND token = '75THlTrwSsI2TS9oXXntB4l8YrQOdHvN0wVnioRWKZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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