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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206cc0f1ded8b70bb472505a7f5cf152e299779b2ca669261776c113095f16d8' 
  AND token = 'NFwOb8MKXAw5x2PwuHFQW16O6ZxQpx3oYpBA98sPhsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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