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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8159d4c8fedccb3a9e8af0710db833194068625ce2753457ca92b69e3dc1bc' 
  AND token = '8jYIthSfSm1IusbRHL+TNIcxgoMTHwIlnVQ0p7ihzu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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