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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2516824bc92a6b6a3773a3e09f2d3b3652d7cbe08050174b4d35f0136389ed0e' 
  AND token = 'yZEELqoQ6MqFj4/NnlkHCf4ezzUyR3txdf2+q7bfsik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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