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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a07da3c925fa255110f6573ca2440c80cbb70502fde825a285207bc55238e' 
  AND token = 'pxT9jANkS4c9bfy/c66NOOMGWrDzfRc1CuKDcCOG0/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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