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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbba25b0b08e346135c3d09df74cb0f4bc2b4cd33a7b6ced5fd73178d7fe1c20' 
  AND token = 'CgGdKne20yGn20WwWrvGCiPD1pASNXmxdEjWrvjDjI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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