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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029395041067fcb26a8a8f4702e6edbe158cc0e162acf269b4de023d8784d4e8' 
  AND token = 'zY2QqG0ZTUxS0cSy7Wrsm6aStM8gnTINAMSgImM/doU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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