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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb88446a9af762c582752e5030c97e1ae1ab635d2931fcb6448d58e89c2a69d' 
  AND token = 'j1+KPtTZIVpihtFEwJDMja+k9bfFc0eoj8Tni1HN+Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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