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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6794f107cdbbcdedb3531ace912f3a59dfd0fa445ca834699fd610678f0aea' 
  AND token = 'WObikgznYMFP7S3g9MteIlfxmy8GsMAivOonbY96PG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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