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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c160e8f36f2edb15a35c2ddbab465fdcac4fff66de325f6fa4e29a5417295dd' 
  AND token = 'IDKWW1RWhRBU1NRVkqvQMzaNeyE8w3Y7WxP9ci5zPS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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