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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc3058fee6e79c3ab9cafa38cb6966723937c27cb96d675e4d19d4c6e763246' 
  AND token = 'dQ2UPhiZAMdNgNQU5xezLwm8lEEVXhsEvxquJcsiE40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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