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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3326f6111560b19146261e178b52321b23312be2ba09c38b9854240e6d586e35' 
  AND token = '2p3HLlgrlIA2pfHfQ0fmFHEekhbLTZ5kNyyKno4teIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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