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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95f263b6f5872875c89aeedd2a0a56262500a7d83d1e6ba47350493e487ba47' 
  AND token = 'S+k+hQ1OLNE/l8WdRrm4IgUE9LX/aTBonawDTz7LxZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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