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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5825deac3e537e4b6e90cdd41c1779f96dead8e4f7a441872edbe64bcd8474' 
  AND token = 'o6f8qMyJT/gGgD/mDNuSxo2yfQLLnahu73lMfTq/vhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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