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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1623114f4ce26afb8c1bcb33aa9536da06e0dda0981574e8a867c1056580b8' 
  AND token = 'XypJMqXGRWdY5HH3EyaC6l5CwGGwFJzsM5ijIsQk98w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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