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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777c15b5436c52b4814190b97317afce6e837de6a835f27b6ac456a4dc9b430d' 
  AND token = '3rYAms8V4D6JKgb6oQmQaN+RHE3srBojg+Ru+OhSTIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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