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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ff859c92e63adf960b4f85c352b3e04e88c4e1943d8ec3e94811e56754ae44' 
  AND token = 'I/wP9Sd4gT6FUG6WVR6vHEYCNYxpP7xkRKLiqhQpbdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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