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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333115f925999caf6271f8040a0afc1dd4d486e83b989620f320b6c8f169fe00' 
  AND token = '2DpqUYlfkkztVIb/XHyNc0Ku35Q281xOG1/bzNyQL6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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