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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e397ffab058dcedbff8b8b24454d2d04afc338604241e1cd1627e196fa4dbf' 
  AND token = 'KJ1vwZrhcjnPiQxqExCJXxEsUcPAkSPwfPJZ7Kgtons=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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