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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74459f5e0889bb6c6832286ae872f0348c89c59a5bca77d1323f477ddb55b4ee' 
  AND token = 'LxSav11nG6g2xW69XeK1DJ0yBtWUpSMhpIfceCmqCEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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