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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bc77e41dfdeef51a34893885f5f3e0775b85dd7bb64ff1533b7c9b8291ec6b' 
  AND token = '+N3qWRcp9mff42JAp77qBxC+9Bmi6P5uXd3n85eq2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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