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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0a38ea34debdb56a3efbacc767e703b801d6c2c2c3058b87d4be1ff05b7d0c' 
  AND token = '5g+ZLj5MqGoYX8JJE9Kx1mjSbHdh7I1r2WKOLU44yvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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