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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b940a9f041e5bb78d8c432dbf193e2f9fc72097af1553bd40c3380a26e5be8' 
  AND token = 'bSz2cPraS1jZJ3nm59D8J1yVohDdYHZJ7cMs+yEX554=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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