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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1d097c2af9650bf06a628268de06160dfb22d8d1b4c81167775707c02ae8b7' 
  AND token = 'kqJxa8kEQR7Sh0Nn2MQih7NRzaQE1Gt50gTNFpgzido=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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