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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a8542ec8b84e4a1a2c349a2fe4a47fc438dada4107f98a9f77651df7445e20' 
  AND token = '8ZGNGyLXVJRLaZJ8K3Z6de+r9jz8Ml0eEF4YUFtUMPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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