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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5086647b9881662d59dedcf0fc5da84af8f1855368d82a762fdb984b0720fa8' 
  AND token = 'BaTlZPvGdfaVWWL0iEd8zWbgQbO6N5Sc54wWWDmMI98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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