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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361a499794fcc08636992ae24b3e776aad5eef0bcf46437eca3cb0b18410dafd' 
  AND token = '7Suzi+55CR0y+W5mjXz7VkRfO1jMvNH6rOxvdGSoAtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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