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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0269405e9f335d16ee663d549cc6755871a9025492e6ccb41dec36345553526' 
  AND token = 'ZHM/X4hPVjq1SAayKqMuF/6yaEqU9qTr3zmDxY5kopM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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