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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9a493c29c78191dfd39e15e1539c7d3a2e622e89184dc22ac533322ef8d7a6' 
  AND token = 'OInjnUvT3vrWgsfOcolnqNAhiy2ao5FgyUKqPmBqvuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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