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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9564664b24791f8fe32eadbee6d96d6bfc4b43cbaad35759592a35477ee15f' 
  AND token = 'E+DmkKFkDWUblT2oIWpVpMV6A0FgvIqS+KrBIabiX1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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