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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf21212d4570da14e9a88054e4a34620c6c702627b0af4ce296b40d86e69703' 
  AND token = 'WJxtsLP4KhZOtza+D2AngPiaZpdpFS3v6Wr9oSnOSh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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