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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc4ea2d3ca1e1c4ce4e61e3f412a26ac5d91b7cec38d4eff685a148e239aa72' 
  AND token = 'g8n7zOH2DQozNzMhnPsHVPj4v/JYa2S88JHtTh5l4YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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