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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403e766ac33236a3600aee3efccd1e13531d38c7bd1bb84636f478e3c91c6002' 
  AND token = '2RWHCW3AL72xcMI6VGGEYJlBP3/d7MirWCNJBQggqcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00826

JSON explain

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