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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d5bad35e8df1d1a35e8bdac6b2f0a613e6982933cd7fc335cd6a15a102d766' 
  AND token = 'u9oAHtR3GbJR5uoeHr3jgYMwlmXEFaH/7V79f0Yjen4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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