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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342ad227a2c985e1d6525200a4b208aab2ee7b5bafd30d4b6efd5d299ddcf2bf' 
  AND token = '2TANPk6g8NuKLsc4CuM2IeOwHvsvUJ3UU9y6AQTWh2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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