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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d068ff6d84e1602013cf096b28e50fa152ee14035fbe7bce0b52a7f49bb1177' 
  AND token = 'sp1AsZC6CuuhMDCMZvbMGG3jGcWStVaMnoR0HTtUHBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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