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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a5d670c62a3c6dea3dd4989babdbc63d6c15e74bba42f388ceb2251fe54fa4' 
  AND token = 'RTXp4FugyFcw9rcLlvJm6yPFZJmD8P+p0al9mcZh4po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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