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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698f86a01a776371ea793f5292a634752eab40c6082b1133ac4b1b8fc08b6aa6' 
  AND token = 'gftzZ5L+/bBs0XcF3b7OFa8gar4+qmO6RemyA7UrP/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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