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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9934547e9c0385452d1c5765cef8ad3159beb963fa594ef6718f2431655608' 
  AND token = 'ZZti5kBqQKqOdPtox7ApIBI/s1JqDOv2KOSomNsTkdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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