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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e1e3e42e7ecab16046acf7ed3e2d9d16d9ed081315d75afbcbd177cdbd7829' 
  AND token = 'FXNRPy3ohgrczQCYatPulbOU/hdrAXjgps8O+0HBW/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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