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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7728bab4a8fa302ab3b06ecc5e4920f2a88dd8ec25564f1ac43e8309be031eaf' 
  AND token = 'gBJR6MbO9kloC97slj1oU6OyFUFyM6HJTz5PkPI9o+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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