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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd9ea704d7dabe43a5b79fb4c7dd0aeb3e3f093e5c859b32da7fceddf9747f4' 
  AND token = 'iyUKbZoGpN4u5rXGx+p+x+ne1wUZr1GINXjTDrwO+fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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