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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89aee87e90f3a8ca90027e3ef6383214ef24c17b6fb2bf6ded17aa4985b5cccc' 
  AND token = 'WQXs02c9N/qhSKI9UkaG696yvlqhQoQsuL6Lr91CrwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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