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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5320033a26e812708d2209589e4246cd5dd8e9b7554c91fd58560ef3026f3438' 
  AND token = 'xmgtBkPyFki62HOTt8RAD9B9ZVEgojIBonhDwSWMm2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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