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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba309a49598e7f0fa0f6fc9ffce63f9aa2209e035e2fc687d38c733a790c91b' 
  AND token = 'QJYRQV/CIOqtzHzjNcHdA8HIn2eJw+JhKNgeIWAh9lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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