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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941bb172ea6912eb7867f8546b7375531ff43bda54ac9e91627292f1685d428e' 
  AND token = '2pD8Rt4QK8sZourguRqfYZFR0oUaOMcpfSObHSBPyFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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