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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834c2797af83a9cd37eb6a8bf4e0e4c2668be381bd342cec61240cda5ce68609' 
  AND token = '/HQLycyeTw/yphJSMQINbDAWGxdCDrp71+3TuakIcyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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