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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3ed38ae438cc02c23ab61f12f1ba674d1e7f52c662c3b2bf68a6e3a9d9f0e0' 
  AND token = 'AI7H9Vh8gC+zTNxBcm6vd36cb+KGKGcAM82HOmoXrjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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