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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c3ff62e4e2f03cd9ba137bd57b243ac1527a8fa1182a0a6ff942acf50ae883' 
  AND token = 'hgv2YFb6k00Ffo08ngf2eXgE2WHGI1Mvv+8nzS9srWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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