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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dcfb089e3e4d3f1067b8aa43480f1f738531c379e99cc6c52774cca2782870' 
  AND token = 'SzyPT0DmvZDL9xfOtoX/Bydg8MolVU2PfEV+74u1q9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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