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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668ffb3e5d7e259e441a667360d7852760cb8db69116fc20ebf0476d2cc849a0' 
  AND token = 'F8d7Pmu/qLRQIw+6PRNIXDg2+k/rm1spKD/OM39rEm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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