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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fad2e886d928d5d50ec39b6a8739979d78677b4bb3f7cac3c75790a3e12df64' 
  AND token = '1CnvdeB7cxlglTcCsNOzk1UA5CA6R/GoA8aUJQjJyxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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