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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c75c5f0a2c104a76bb6fc1193346b9cad164c1357a23e979b9e19238234000' 
  AND token = 'Pk52dDRVukHhLDaZnIYeVQ/yanVFe7JHDR+6WZnVTSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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